*{padding: 0;margin: 0;}
html {
    font-size: 20px;
}
input{
    outline: none;
    background-color: transparent;
    border: none;
}
body {
    font-family: "Helvetica Neue", Helvetica, Arial, "Hiragino Sans GB", "Hiragino Sans GB W3", "WenQuanYi Micro Hei", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
}

a {
    text-decoration: none;
}

a img {
    border: 0;
}

@media screen and (min-width:640px ) { .main{border: 1px solid #cccccc;}}